Tilting table for wood-working machines



(No Model.)

B. G LUTHER. TILTING. TABLE FOR WOOD WORKING MACHINES. No. 370,633.Patented Sept. 27,1887.

UNITED STATES PATENT rrrcn.

.BENJAMIN G. LUTHER, OF WORCESTER, MASSACHUSETTS.

TILT ING TABLE FO R WOOD-WORKING MACHINES.

SPECIFICATION forming part of Letters Patent No. 370,633, datedSeptember 27, 1887.

Application filed March 14, 1887. Serial No. 230,904.

To all whom it may concern:

Be it known that I, BENJAMIN G. LUTHER, a citizen of the United States,residing at Worcester, in the State of Massachusetts, have invented anImprovement in Tilting Tables for WVood-Working Machinery, of which thefollowing is a specification.

llIy invention consists in the combination of the Work-holding tablewith an improved clamping-joint made in the form of a spherical segment,whereby the table may be tilted in various directions, and be properlyclamped in any desired position, the construction of such clamping-jointbeing such as to effect a considerable saving in the cost of machines towhich my improvement is applied over the devices heretofore employed forthe same purpose.

Figure 1 is a side elevation of a wood-boring machine provided with myimprovement, the tilting table anda portion of the attachingbracketbeing shown in vertical section. Fig. 2 is a plan view of the hollowspherical segment to which the work-holding table is attached. Fig. 3 isa central section of the same, taken in the line 00 as of Fig. 2. Fig. 4represents an enlarged vertical section of my improved tilting tableprovided with a hollow clamping-bolt.

In the accompanying drawings, A is the frame of a boring-machine; B, therevolving spindle, which serves to hold the boring-bit, and which ismoved up and down, asusual in such machines, by means of the treadle Gand spring D and the connecting devices.

At the front of the frame A is secured the vertically-adjustable bracketE, which is held to the frame by means of the gib-slide a, and which isoperated up and down by means of the screw 1), held in the fixed nut cand suitable bearings, and rotated by means of the bevel-gear d upon theend of the screw and the bevel-gear d and hand-wheel e, secured to theshaft f, which is held in the fixed bearing g, secured to the bracket.

Upon the upper side of the bracket E, and at the forward end of thesame, is placed the hollowed seat F, which is provided with a centralperforation, h, to receive the bolt G,

which also passes downward through a per- (No model.)

foration, t, in the bracket, which perforation is in line with the axisof the revolving spinhollowed concavo-convex plate H, which is.

provided with the annular flange k, by means of which it is attached tothe under side of the table I, the curve of the plate H preferablyforming a semicircle having its diameter in the plane of the uppersurface of the table.

The concavo-convex portion of the plate H may be provided centrally witha single slot adapted to receive the bolt G; or the same may be providedwith a cross-slot, 0, as shown in Figs. 2 and 3; or the central portionof the plate may be cut out in circular form, as indicated by the brokencircle in Fig. 2, and in either case the table I can be turned upon thebolt G as a pivot and be tilted in any direction desired, and clamped inthe required position by screwing up the nut a of the bolt G.

The hollowed seat F and the spherically concavo-convex plate H may bereadily cast in true form for adaptation to each other without latheturning, and the table so mounted will be firmly held in its requiredposition by means of the clamping head and nutjn of the bolt.

A modification of my invention is shown in Fig. 4:, in which theclamping-bolt G is made hollow, and thus adapted for the passage of asaw, J, or other tool; and in adapting my improvement to a j ig-saw thehollow bolt may be made to embrace and hold the lower guide for the saw.

The table I may be continued backward and made to embrace the uprightportion of the frame A, as shown by the broken lines in Fig. 1, and inthis case the table will not be capable ofrotation upon the bolt G as apivot; but with a single slot in the plate H it can be tilted in onevertical plane, and with the cross-slots shown in Figs. 2 and 3 thetable can be tilted in two vertical planes at right angles to eachother, and in the case of the circular opening in the central portion ofthe plate H the table can be tilted in any required direction withoutrotating the table upon the bolt G.

The bearingseat F may be made integral KOO perforated bearing-seat, theconcave-convex plate resting upon the bearing-seat and provided with acentral opening, and the hollow I5 fastening-bolt passing through thecentral openings of the plate and bearing-seat, with the head resting inthe cavity of the plate, substantially as described.

BENJAMIN G. LUTHER.

Witnesses:

HARMON S. BABCOCK, SooRA'rEs SOHOLFIELD.

